bianna and dan? >> not encouraging hearing the speaker say god only knows. david kerley, thank you. >>> this is another example of how toxic the atmosphere in washington is right now. when the head of the national rifle association called a news conference to respond to the school shootings in newtown. you can see here. he was repeatedly interrupted by protesters. and celebrities are weighing in on this issue. here's abc's pierre thomas. >> reporter: the nra's solution for the massacre at sandy hook, armed security in every school. >> the only thing that stops a bad guy with a gun is a good guy with a gun. >> the nra has blood on its hands. >> reporter: the nra leader had barely begun when protesters blamed the powerful lobby for the nation's epidemic of gun violence. >> nra, stop killing our children. >> reporter: but the nra was defiant. after remaining silent in the wake of the worst elementary school shooting in the nation's history, wayne lapierre was on the attack, blaming others for the recent carnage. high on the list, violent video games. >> there e